Messages in this thread Patch in this message | | | From | Lino Sanfilippo <> | Subject | [PATCH 1/2] net: dsa: tag_ksz: linearize SKB before adding DSA tag | Date | Wed, 14 Jul 2021 21:17:22 +0200 |
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In ksz9477_xmit() skb_put() is used to add the DSA tag to the passed SKB. However skb_put() must only be called for linear SKBs which may not be the case if the DSA slave device inherited NETIF_F_SG from the master device. So make sure the SKB is always linearized.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> --- net/dsa/tag_ksz.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c index 53565f48934c..364f509d7cd7 100644 --- a/net/dsa/tag_ksz.c +++ b/net/dsa/tag_ksz.c @@ -53,6 +53,9 @@ static struct sk_buff *ksz8795_xmit(struct sk_buff *skb, struct net_device *dev) u8 *tag; u8 *addr; + if (skb_linearize(skb)) + return NULL; + /* Tag encoding */ tag = skb_put(skb, KSZ_INGRESS_TAG_LEN); addr = skb_mac_header(skb); @@ -114,6 +117,9 @@ static struct sk_buff *ksz9477_xmit(struct sk_buff *skb, u8 *addr; u16 val; + if (skb_linearize(skb)) + return NULL; + /* Tag encoding */ tag = skb_put(skb, KSZ9477_INGRESS_TAG_LEN); addr = skb_mac_header(skb); @@ -164,6 +170,9 @@ static struct sk_buff *ksz9893_xmit(struct sk_buff *skb, u8 *addr; u8 *tag; + if (skb_linearize(skb)) + return NULL; + /* Tag encoding */ tag = skb_put(skb, KSZ_INGRESS_TAG_LEN); addr = skb_mac_header(skb); -- 2.32.0
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